Exactly fitting or perfectly appropriate; to feel right (often used as しっくりくる).
この椅子は座るとしっくりくるので長時間座っても疲れない。
This chair fits well when you sit in it, so you don't get tired even after sitting a long time.
彼の説明はしっくり来なくて、もっと詳しく聞きたい。
His explanation didn't sit right with me; I want to ask for more details.
新しい髪型が顔にしっくり合っている。
The new hairstyle suits his/her face perfectly.
To be fitting or appropriate — the state or feeling that something matches well.
彼らのチームワークがしっくりしているから、仕事が早く進む。
Their teamwork fits well, so work progresses quickly.
この配置は見た目にも機能面でもしっくりする。
This arrangement is fitting both aesthetically and functionally.